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Journal of Cell Science, Vol 63, Issue 1 125-134, Copyright © 1983 by Company of Biologists

JOURNAL ARTICLES

Ultrastructural aspects of sporogenesis in the apogamous fern Dryopteris borreri

E Sheffield, S Laird and PR Bell

The events that accompany sporogenesis in the apogamous fern Dryopteris borreri parallel those seen in sexually reproducing ferns. Organelles dedifferentiate and redifferentiate, and form a discrete band across the equator of dyads; nuclear vacuoles and lipid spherosomes appear during prophase, and the major part of the ribosome population is removed and subsequently replaced during meiosis. Similar events have been found to occur during sporogenesis in mosses, gymnosperms and angiosperms, and therefore characteristic of the meiotic transition from sporophyte to gametophyte, even in the absence of a transition from diplophase to haplophase. The novel aspects of meiosis in D. borreri are largely those connected with the restitution event that precedes meiosis I and serves to maintain the sporophytic chromosome number throughout the life cycle of this fern. Pre-meiotic cells are regularly found to be cleaved by annular wall ingrowths, which traverse the cytoplasm but not the nuclei. The significance of these ingrowths in relation to theories concerning apogamy and plant cell division are discussed.


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L. G. QUINTANILLA and A. ESCUDERO
Spore Fitness Components Do Not Differ Between Diploid and Allotetraploid Species of Dryopteris (Dryopteridaceae)
Ann. Bot., September 1, 2006; 98(3): 609 - 618.
[Abstract] [Full Text] [PDF]


© The Company of Biologists Ltd 1983